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agent/src/share/classes/sun/jvm/hotspot/oops/Oop.java@63997f575155 (annotated)

agent/src/share/classes/sun/jvm/hotspot/oops/Oop.java

Wed, 30 Mar 2011 07:47:19 -0700

author

never

date

Wed, 30 Mar 2011 07:47:19 -0700

changeset 2693

63997f575155

parent 2384

0a8e0d4345b3

child 4037

da91efe96a93

permissions

-rw-r--r--

7031614: jmap -permstat fails with java.lang.InternalError in sun.jvm.hotspot.oops.OopField.getValue
Reviewed-by: kvn, dcubed

duke@435	1	/*
never@2693	2	* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	package sun.jvm.hotspot.oops;
duke@435	26
duke@435	27	import java.io.*;
duke@435	28	import java.util.*;
duke@435	29	import sun.jvm.hotspot.utilities.*;
duke@435	30	import sun.jvm.hotspot.debugger.*;
duke@435	31	import sun.jvm.hotspot.runtime.*;
duke@435	32	import sun.jvm.hotspot.types.*;
duke@435	33	import sun.jvm.hotspot.memory.CompactingPermGenGen;
duke@435	34
duke@435	35	// Oop represents the superclass for all types of
duke@435	36	// objects in the HotSpot object heap.
duke@435	37
duke@435	38	public class Oop {
duke@435	39	static {
duke@435	40	VM.registerVMInitializedObserver(new Observer() {
duke@435	41	public void update(Observable o, Object data) {
duke@435	42	initialize(VM.getVM().getTypeDataBase());
duke@435	43	}
duke@435	44	});
duke@435	45	}
duke@435	46
duke@435	47	private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
duke@435	48	Type type = db.lookupType("oopDesc");
duke@435	49	mark = new CIntField(type.getCIntegerField("_mark"), 0);
coleenp@548	50	klass = new OopField(type.getOopField("_metadata._klass"), 0);
coleenp@548	51	compressedKlass = new NarrowOopField(type.getOopField("_metadata._compressed_klass"), 0);
duke@435	52	headerSize = type.getSize();
duke@435	53	}
duke@435	54
duke@435	55	private OopHandle handle;
duke@435	56	private ObjectHeap heap;
duke@435	57
duke@435	58	Oop(OopHandle handle, ObjectHeap heap) {
duke@435	59	this.handle = handle;
duke@435	60	this.heap = heap;
duke@435	61	}
duke@435	62
duke@435	63	ObjectHeap getHeap() { return heap; }
duke@435	64
duke@435	65	/** Should not be used or needed by most clients outside this
duke@435	66	package; is needed, however, by {@link
duke@435	67	sun.jvm.hotspot.utilities.MarkBits}. */
duke@435	68	public OopHandle getHandle() { return handle; }
duke@435	69
duke@435	70	private static long headerSize;
coleenp@548	71	public static long getHeaderSize() { return headerSize; } // Header size in bytes.
duke@435	72
duke@435	73	private static CIntField mark;
duke@435	74	private static OopField klass;
coleenp@548	75	private static NarrowOopField compressedKlass;
duke@435	76
duke@435	77	public boolean isShared() {
duke@435	78	return CompactingPermGenGen.isShared(handle);
duke@435	79	}
duke@435	80
duke@435	81	public boolean isSharedReadOnly() {
duke@435	82	return CompactingPermGenGen.isSharedReadOnly(handle);
duke@435	83	}
duke@435	84
duke@435	85	public boolean isSharedReadWrite() {
duke@435	86	return CompactingPermGenGen.isSharedReadWrite(handle);
duke@435	87	}
duke@435	88
duke@435	89	// Accessors for declared fields
duke@435	90	public Mark getMark() { return new Mark(getHandle()); }
coleenp@548	91	public Klass getKlass() {
coleenp@548	92	if (VM.getVM().isCompressedOopsEnabled()) {
coleenp@548	93	return (Klass) compressedKlass.getValue(this);
coleenp@548	94	} else {
coleenp@548	95	return (Klass) klass.getValue(this);
coleenp@548	96	}
coleenp@548	97	}
duke@435	98
duke@435	99	public boolean isA(Klass k) {
duke@435	100	return getKlass().isSubtypeOf(k);
duke@435	101	}
duke@435	102
duke@435	103	// Returns the byte size of this object
duke@435	104	public long getObjectSize() {
duke@435	105	Klass k = getKlass();
never@2693	106	// All other types should be overriding getObjectSize directly
never@2693	107	return ((InstanceKlass)k).getObjectSize(this);
duke@435	108	}
duke@435	109
duke@435	110	// Type test operations
duke@435	111	public boolean isInstance() { return false; }
duke@435	112	public boolean isInstanceRef() { return false; }
duke@435	113	public boolean isArray() { return false; }
duke@435	114	public boolean isObjArray() { return false; }
duke@435	115	public boolean isTypeArray() { return false; }
duke@435	116	public boolean isSymbol() { return false; }
duke@435	117	public boolean isKlass() { return false; }
duke@435	118	public boolean isThread() { return false; }
duke@435	119	public boolean isMethod() { return false; }
duke@435	120	public boolean isMethodData() { return false; }
duke@435	121	public boolean isConstantPool() { return false; }
duke@435	122	public boolean isConstantPoolCache() { return false; }
duke@435	123	public boolean isCompiledICHolder() { return false; }
duke@435	124
duke@435	125	// Align the object size.
duke@435	126	public static long alignObjectSize(long size) {
kvn@1926	127	return VM.getVM().alignUp(size, VM.getVM().getMinObjAlignmentInBytes());
duke@435	128	}
duke@435	129
duke@435	130	// All vm's align longs, so pad out certain offsets.
duke@435	131	public static long alignObjectOffset(long offset) {
duke@435	132	return VM.getVM().alignUp(offset, VM.getVM().getBytesPerLong());
duke@435	133	}
duke@435	134
duke@435	135	public boolean equals(Object obj) {
duke@435	136	if (obj != null && (obj instanceof Oop)) {
duke@435	137	return getHandle().equals(((Oop) obj).getHandle());
duke@435	138	}
duke@435	139	return false;
duke@435	140	}
duke@435	141
duke@435	142	public int hashCode() { return getHandle().hashCode(); }
duke@435	143
duke@435	144	/** Identity hash in the target VM */
duke@435	145	public long identityHash() {
duke@435	146	Mark mark = getMark();
duke@435	147	if (mark.isUnlocked() && (!mark.hasNoHash())) {
duke@435	148	return (int) mark.hash();
duke@435	149	} else if (mark.isMarked()) {
duke@435	150	return (int) mark.hash();
duke@435	151	} else {
duke@435	152	return slowIdentityHash();
duke@435	153	}
duke@435	154	}
duke@435	155
duke@435	156	public long slowIdentityHash() {
duke@435	157	return VM.getVM().getObjectSynchronizer().identityHashValueFor(this);
duke@435	158	}
duke@435	159
duke@435	160	public void iterate(OopVisitor visitor, boolean doVMFields) {
duke@435	161	visitor.setObj(this);
duke@435	162	visitor.prologue();
duke@435	163	iterateFields(visitor, doVMFields);
duke@435	164	visitor.epilogue();
duke@435	165	}
duke@435	166
duke@435	167	void iterateFields(OopVisitor visitor, boolean doVMFields) {
duke@435	168	if (doVMFields) {
duke@435	169	visitor.doCInt(mark, true);
coleenp@548	170	if (VM.getVM().isCompressedOopsEnabled()) {
coleenp@548	171	visitor.doOop(compressedKlass, true);
coleenp@548	172	} else {
coleenp@548	173	visitor.doOop(klass, true);
coleenp@548	174	}
duke@435	175	}
duke@435	176	}
duke@435	177
duke@435	178	public void print() { printOn(System.out); }
duke@435	179	public void printValue() { printValueOn(System.out); }
duke@435	180	public void printRaw() { printRawOn(System.out); }
duke@435	181
duke@435	182	public static void printOopValueOn(Oop obj, PrintStream tty) {
duke@435	183	if (obj == null) {
duke@435	184	tty.print("null");
duke@435	185	} else {
duke@435	186	obj.printValueOn(tty);
duke@435	187	tty.print(" @ " + obj.getHandle());
duke@435	188	}
duke@435	189	}
duke@435	190
duke@435	191	public static void printOopAddressOn(Oop obj, PrintStream tty) {
duke@435	192	if (obj == null) {
duke@435	193	tty.print("null");
duke@435	194	} else {
duke@435	195	tty.print(obj.getHandle().toString());
duke@435	196	}
duke@435	197	}
duke@435	198
duke@435	199	public void printOn(PrintStream tty) {
duke@435	200	OopPrinter printer = new OopPrinter(tty);
duke@435	201	iterate(printer, true);
duke@435	202	}
duke@435	203
duke@435	204	public void printValueOn(PrintStream tty) {
duke@435	205	try {
duke@435	206	tty.print("Oop for " + getKlass().getName().asString());
duke@435	207	} catch (java.lang.NullPointerException e) {
duke@435	208	tty.print("Oop");
duke@435	209	}
duke@435	210	}
duke@435	211
duke@435	212	public void printRawOn(PrintStream tty) {
duke@435	213	tty.print("Dumping raw memory for ");
duke@435	214	printValueOn(tty);
duke@435	215	tty.println();
duke@435	216	long size = getObjectSize() * 4;
duke@435	217	for (long i = 0; i < size; i += 4) {
duke@435	218	long memVal = getHandle().getCIntegerAt(i, 4, true);
duke@435	219	tty.println(Long.toHexString(memVal));
duke@435	220	}
duke@435	221	}
duke@435	222
duke@435	223	public boolean verify() { return true;}
duke@435	224
duke@435	225	// Package-private routine to speed up ObjectHeap.newOop
duke@435	226	static OopHandle getKlassForOopHandle(OopHandle handle) {
duke@435	227	if (handle == null) {
duke@435	228	return null;
duke@435	229	}
coleenp@548	230	if (VM.getVM().isCompressedOopsEnabled()) {
coleenp@548	231	return handle.getCompOopHandleAt(compressedKlass.getOffset());
coleenp@548	232	} else {
coleenp@548	233	return handle.getOopHandleAt(klass.getOffset());
coleenp@548	234	}
duke@435	235	}
duke@435	236	};